Third to hugh p



(No Model.)

D. BMQKEE.

LIFTIN-G' MACHINE.

No. 363,476. Patented May24, 1887.

N PETERS. Pholo-Lilllcgmphnr. Wanhingtom n. a

UNITED STATES PATENT OFFICE.

DAVID E. 'MOKEE, OF POTTER VALLEY, CALIFORNIA, ASSIGNOR OF ONE- THIRD TO HUGH P. MOGEE, OF SAME PLACE.

LlFTlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 363,476, dated May 24.

Application filed February 18, 1887. Serial No.

To aZZ whom it may concern.-

Be it known that I, DAVID E. MOKEE, of Potter Yalley, Mendocino county, State of Cal fornia, have invented an Improvement in L1ft ng-1\Iachines; and I hereby declare the following to be a full, clear, and exact descriptlon of thersame. 1

My invention relates to that class ofliftingmachines in which the frame-work is a derr ck-hke structure; and my invention consists in a fixed mast, a boom hinged thereto and adapted to move through an arc in a vertical plane, said boom beingjointed, so that it: can also move through an arc in a horizontal plane, a block and tackle, and a winch for operating said boom, an adjustable extension for the boom, peculiarly operating and constructed hfting fingers upon the end of the boom or its extension, and details of construction relating to the several adjustments and operations of the machine, all of which I shall hereinafter fully describe.

The object of my invention is to provide a slmpleand effective machine forraising weights of any description, either merchandise, sacks of grain, hay, or anything else required to be elevated, said machine being of a character easily transported and readily set up in the desired position.

Referring to the accompanying drawings for a more complete explanation of myinvention, Figure 1 is a perspective view of my lifting machine. Fig. 2 is a longitudinal section showing the engagement of the boom and its extension. 'Fig. 3 is a detail of the fingers I, showing the boards 0.

A is the mast, which is to befixed firmly in position so that it remains stationary.

B is the boom, hinged to the mast at b so that it may have a movement through an arc in a vertical plane.

C is the block and tackle, connected with the outer end of the boom, passing over suitable pulleys in the top of the mast, and down to the operating-winch 0 on the side of the mast, by which means the boom maybe raised and lowered on its pivotal center, where it is joined to the mast.

The boom is jointed at b and provided at that point with the hinge b so that the outer section of the boom may have a side move- (No model.)

ment ofits own. The two sections of the boom are held together normally by means of a lever,

D, attached to the outer section, and having a sion which is fitted upon the outer section of the boom in suitable stirrups or guides, f, so that it may have a longitudinal movement in the line of the boom for extension purposes.

This movement is readily effected by means of a pinion, G, on a crank-shaft, said pinion meshing with a rack, f, on the under surface of the extension.

In order to prevent the extension from moving from its position to which it is adjusted and to control it, I have under the main boom a spring-actuated pawl, H, the end of which, operating through a slot in the boom, engages the rack on the under surface of the extension. On the outer end of the boom, or, as here shown, on the extension F, are the lifting-fingers I, consisting of curved tines made in the nature of a hay-fork. These tines are secured in heads 6, which are pivoted on a transverse shaft mounted in the outer end of the extension. The inner pair of said heads have segmental gears '6. In the outer end of the ex tension is also mounted a crank-shaft, J, having at its center a crank, j, to which is attached a connectingrod, 7r, passing backwardly over the extension to a pivoted lever, K.

The ends of the crank-shaft are provided with pinions L, which mesh with the segmental gears 11' of the heads of the inner pair.

of lifting-fingers. To these gears, or to the shaft, are also attached the crank -arms m, from which connecting-rods M extend to the ends of the heads of the other pair of liftingfingers. The operation of these lifting-fingers is as follows: By pulling the lever K back to ward the mast the crankshaft J is oscillated, whereby,through its pinion's L engaging with the segmental heads 2" of the pair of fingers, it turns said heads on their pivotal centers, and

winch the boom is relieved, so that it descends by its own weight until its end is in such aposition as to connect with or be connected with the material to be raised. In some cases the extension part of the boom will be entirely re ""moved and the weight will'be suspended di I has to-be raised, I adjust the extension part of rectly from the end of the main boom. If when lowered to position the boom is still to one side of the object to be raised, I can throw its outer section over into the proper position by means of the lever D. The weight being now hooked on to the end of the boom, the winch is operated and the boom is raised on its pivotal connection with the mast, and, if needed, its outer section is .thrown around in front of or behind the mast to deposit its load. In case such material as hay or sacks of grain the boom, and by means of the crank-shaft and pinion run said extension in or out along the boom to suit the position of the material to be raised. The boom being lowered and adjusted as before, the liftingfingers of the extension fit over the material to be raised. The lever K is then operated to close the fingers, and the elevation takes place, as before described. In case of lifting sacks of grain I would use small 7 transverse boards 0 to prevent the liftingfingers from tearing the sacks.

The machine may be used in many positions, and is especially adapted to accompany a wagon, as its mast may be readily secured to some portion of the wagon, as by clamping it to the spokes of one of its wheels.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a lifting-machine, a stationary mast, in combination with a boom hinged to the mast so as to move through an arc in a vertical plane, said boom being jointed and its sections hinged together, whereby its outer section may have an independent movement sidewise, a block and tackle for elevating the boom on its pivotal connection with the mast, and a winch for operating the block and tackle, substantially as herein described.

2. In a lifting-machine, a stationary mast, in combination with a boom hinged to the mast, whereby it may have a movement through an arc in a vertical plane, said boom being jointed and its sections hinged together, whereby the outer section may have an independent movement sidewise, the lever D, by which the two sections are locked together and the outer section operated, a block and tackle for elevating the boom, and the winch on the mast for operating the block and tackle, substantially as herein described.

3. In a lifting-machine, a stationary mast, in combination with the boom hinged to the mast and jointed, whereby it may have a move ment through an arc in a vertical plane and its outer section 'have a movement sidewise, the longitudinallyadjustable extension fitted and guided upon and moving in the line of the boom, the block and tackle for operating the boom, and the winch on the mast for operating the block and tackle, substantially as herein described.

4. In a liftingmachine, a stationary mast, in combination with a boom hinged thereto whereby it may have a movement in a vertical plane, said boom beingjointed and its sections hinged together, whereby its outer section may have a movement sidewise, the lever D, for locking the two. sections together and operating the outer section, the longitudinallyadjustable extension F, mounted upon and moving in line with the boom, the block and tackle O, for operating the boom, and the wlnch c on the mast, for operating the block and tackle, substantially as herein described.

5. In a lifting-machine, the stationary mast, the boom connected therewith and adjustable, as described, the block and tackle for operating the boom, and the winch on the mast for operating the block and tackle, in combination with the extension F on the boom, guided by the stirrnps f, and the means for longitudinally adjusting said extension, consisting of the crank-shaft g, the pinion G thereon, and the rackf on the under side of the extension, substantially as herein described.

6. In a lifting-machine, the stationary mast, the boom connected therewith and adjustable, as described, the block and tackle for operating the boom, and the winch on the mast for operating the block and tackle, in combination with the extension F, mounted upon the boom, the means for longitudinally adjusting the extension, consisting of the crank-shaft g, the pinion G thereon, and the rackf 011 the under sur face of the extension, and the springactuated controlling-pawl H, by which the extension is controlled, substantially as herein described.

7. In a liftingmaehine, the stationary mast and the boom connected therewith and adj ustable, as described, the block and tackle for operating the boom, and the winch on the mast for operating the block and tackle, in combination with the lifting-fingers I at the outer end of the boom, having the pivoted heads 1', and the means for operating said fingers, consisting of the lever K, the connecting-rodk, the crank-shaft J, the pinions L thereon, the segmental gears z" on the heads of one pair of fingers, the cranks m 011 the shaft, and the con meeting-rods M, joining them with the heads of the other pair of fingers, substantially as herein. described.

8. In a lifting-machine, thelifting-fingers I,

IIS

having pivoted heads i, in combination with the means for operating said fingers, consisting of the lever K, connecting-rod 7c, the crankshaft J, the gears L, the segmental gears t" on the heads of one pair of fingers, the cranks m, and the connecting-rods M, connecting said cranks With the heads of the otherpair of fingers, substantially as-herein described.

9, A lifting-machine comprising the fixed mast A, the boom B, pivoted thereto, whereby it may move through an arc of a vertical plane, said boom being j ointed and its sections hinged together, whereby its outer section may have a movement sidewise, the block and tackle G, for operating the boom, the winch c on the mast, for operating the block and tackle, the longitudinally-adjustable extension F on said boom, and the adjustable fingers I, carried in the ends of said extension, all combined substantially as herein described.

10. The lifting machine comprising the stationary mast A, the boom B, hinged thereto and jointed, whereby it may have adjustments as described, the lever D, for locking the sections of the boom together and operating its outer section sidewise, the block and tackle G, for elevating the boom, and the winch c on the mast, for operating the block and tackle, the longitudinally-adjustable extension F on the boom, the fingers I, carried in the end of the extension, having pivoted heads z, and the means for operating the fingers, consisting of the crankshaft J, the lever K, connecting-rod k, the pinions L on the crank-shaft, the segmental gears i on the heads of one pair of fingers, the cranks m,and the connecting-rods M, joining said cranks with the heads of the other pair of fingers, all combined, arranged, andadapted to operate substantially'as herein described.

In witness whereof I have hereunto set my hand.

DAVID E. MoKEE. Witnesses:

BEN W. DAY, S. H. RICE. 

